and about the bureau's handling of the older brother tamerlan tsarnaev. let's go to chief political analyst gloria borger. talk about the pressure, the pressure the fbi is under to explain what the heck happened. >> announcer: lot of pressure. first of all, members of congress want to do their job and know what the fbi knew, when, they want to make sure information wasn't what we call in washington speak siloed, you know, post 9/11 the big issue was that agencies need to be sharing information. they want to make sure that, for example, the fbi, department of homeland security, intelligence were all sharing information. there is another really important question which just sort of came up today. if the fbi investigated this man and decided he was not really a threat, they contact the russians, they try to get more information, they don't get more information, what can they then do that doesn't violate federal guidelines to continue to pursue him? where do they have to cut it off? where does legal and illegal surveillance begin? there are federal guidelines